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Error C2664 Callback


Thank you! :) Faq Reply With Quote Share This Thread  Tweet This + 1 this Post To Linkedin Subscribe to this Thread  Subscribe to This Thread « Previous Thread share|improve this answer edited Nov 8 '11 at 3:13 answered Nov 8 '11 at 2:44 Joachim Pileborg 210k15141249 Because those aren't any more compatible. –GManNickG Nov 8 '11 at The internet is a good reference point but no comparison to people in the know. This will only be possible if you create the timer from within the CTestDlg class somewhere. http://megavoid.net/error-c2664/error-c2664.html

Physically locating the server Heathrow to Gatwick and traffic jam more hot questions question feed lang-cpp about us tour help blog chat data legal privacy policy work here advertising info mobile All rights reserved. But we know that it is OK (since we’ll only use it for buttons). In a more modern toolkit, we could have associated our action with a variety of different events (like button push, button release, …). read this post here

Error C2664 Callback

Here, it’s pretty safe. In this case though, it won't be able to access the class members though, since it is not a member function. Bring up the Class Wizard (Ctrl-W will do this). 2. The Visual C++ .NET instructions worked perfectly.

We tell FlTk what we want to pass when we setup the callback. Accept Home Calendar Calendar Syllabus Tutorials Basic Info Assignments Readings Subscribe Fall 2014 - CS559 Computer Graphics Course Archive for CS559-f14 C++ Tutorial Help: Understanding FlTk Callbacks by Mike Gleicher on Register now! Error C2664 Cannot Convert Argument So we could try to write: void whenPushed3(Fl_Widget* w, void*) { if (w->value()) printf("Ouch!\n"); else printf("Ahhh!\n"); } Except this won’t compile!

If I am fat and unattractive, is it better to opt for a phone interview over a Skype interview? Error C2664 Cannot Convert Parameter 1 From students who have girlfriends/are married/don't come in weekends...? This is because of scoping rules. https://bytes.com/topic/c/answers/705463-c2664-passing-member-function-pointer You can: Change the type of your argument to accept member functions and also accept an instance to be the invoking object Quit trying to pass a member function and pass

Join them; it only takes a minute: Sign up C++ Function Callbacks: Cannot convert from a member function to a function signature up vote 4 down vote favorite I'm using a Error C2664 Cannot Convert Parameter From Const Char To Lpcwstr Also, should it have anything to do with this... Superposition of images Using DC voltage instead of AC to supply SMPS When must I use #!/bin/bash and when #!/bin/sh? The main one is: typedef void(Fl_Callback )(Fl_Widget *, void *) What this tells us (in C++ crypticness) is that a callback is a function (that’s why its in parenthesis, and has

Error C2664 Cannot Convert Parameter 1 From

That's all I've been doing for the past hours and most of what I have found is conflicting examples- none of which seem to work for me. https://www.opengl.org/discussion_boards/showthread.php/143389-The-problem-of-callback-function-gluTessCallback It is part of a third party library. Error C2664 Callback Thanks P.S. Error C2664 In C++ The generic widget has no value – only buttons do.

Back to top Back to General Programming Old topic! http://megavoid.net/error-c2664/error-c2664-int.html Unfortunately my automatic notification settings must be incorrect, and I didn't notice your response until this morning. That definitely won't work. Unfortunately, removing the parentheses won't make this work either. Error C2664 Lpcwstr

May be the data passed would be enough for you t identify the object required and then call a normal method on the object from the class member function. Got it! The callback function needs to have access to the front panel, and as such needs to be a member of the front panel class. navigate here Terms of Use Trademarks Privacy Statement Back to top As of July 15, 2016 EldoS Corporation will operate as a division of /n software inc.

It is called here. /* we want to use our own read function */ curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback); CURL API CURLOPT_READFUNCTION Pass a pointer to a function that matches the following prototype: C++ Function Pointer So, for example, I’ll make the pointer point to a string (notice the cast!) … void whenPushed6(Fl_Widget* w, void* p) { printf("%s says:", (char*)p); if (((Fl_Button*)w)->value()) printf("Ouch!\n"); else printf("Ahhh!\n"); } and You can find out more about and set your own preferences here.

Covered by US Patent.

and this isnt my code btw- i ripped it right off of this tutorial the line of code it's hanging on is this: gluTessCallback(tobj, GLU_TESS_VERTEX, (GLvoid (*) ( )) &vertexCallback); check hope this helps any.... We’ll have to know what the pointer really points to, and tell C++. He enjoys backgammon, yoga, and hanging out at Experts-Exchange.

In C++ we can inherit them.' [edited by - eldee on September 30, 2002 8:38:35 PM] Back to top #2 Alpheus Crossbones+ -Reputation: 6644 Like Likes Like Posted 30 September Oh well. Check options Login | Register EldoS | Feel safer! http://megavoid.net/error-c2664/error-c2664-in.html I also wouldn't hire a marketing firm to build my website." - Nilpo Faq Reply With Quote March 17th, 2005,12:35 PM #5 No Profile Picture dmittner View Profile View Forum

So, for example, when my window is created I might make a button: Fl_Button* button = new Fl_Button(100,100,50,20,”Push Me”); Which you should recognize as making a push button object (at position Previous post: Project 1 Announced! So, for example, if you want to have something happen when you press a button, you define a function that does the thing that should happen. The callback happens when the button is released.

If you wish to continue this conversation start a new topic. Click on it to bring up a list of messages. 4. The register function looks something like this. http://curl.haxx.se/libcurl/c/ftpupload.html The error is in this bit of code.

When calling SetTimer(), pass NULL as the third parameter. FlTk doesn’t give us that choice. It is doing an fread() on the FILE * userdata set with CURLOPT_READDATA. What it does do is allow us to have the callback called every time anything happens to the button by setting it’s “when” attribute.

Not the answer you're looking for? Heathrow to Gatwick and traffic jam Why aren't Muggles extinct? The downside to this is that you can't treat class member functions and pointers to them the same way you'd handle regular functions. Bugs: when doing TFTP uploads, you must return the exact amount of data that the callback wants, or it will be considered the final packet by the server end and the

In this case you change setCallbackFunction (or add an overload of it) and all the relevent places in the LRTimer class to accept a pointer to and object of type CTestDlg. If so then pass a pointer to your CTestDlg instance to the LRTimer, the callback can then be a member function of CTestDlg which LRTimer can call directly, but you would Here is what I would say is a better solution You need a way to associate the LRTimer instance with the CTestDlg instance. And yes..